Early A Body Sway Bars

Anyone here have experience with a Firm Feel rear sway bar? The brackets that mount to the fram rails are bolted down with sheet metal bolts. Does this hold up overtime? Does this give a solid mount? I would think a lot better design would be to put a sleeve through the framerail and run a bolt to squeeze the bracket from both sides...like how Hellwig mounts their link bolt.

Anyhoe, I guess if it doesn't feel good I'll weld the bracket to the frame - I'll probably get to this anyhow. Then I believe the Firm Feel would be the superior design.
The factory Mopar rear sway bars are held in with self-tapping cap screws so I see no problem as long as your frame rail is sound. A welded in sleeve with through bolts would be nice too but you'd have to drill a large hole all the way through and then weld in the sleeve flush with the frame rail so the bracket will straddle the rail without deforming. Sounds like more trouble than it's worth. My understanding is that too big a rear sway bar can cause handling problems......Anyone have that happen to them?